/**
 * Created by 王景华 on 2021/1/3 5:19 下午.
 */

#include <stdio.h>
#define PI 3.14159;
int main(){

    float area, radius, circum;

    printf("Input your radius\n");
    scanf("%f", &radius);

    area = radius * radius * PI;
    circum = 2.0 * radius * PI;

    printf("circum is %1.2f\n", circum);
    printf("area is %1.2f\n", area);


    return 0;
}